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Tagsthinnest-arch
1 place carries this tag, across every kind and continent it appears in.
🇮🇷 Iran · Hydraulic works
Ilkhanid to Qajar (Mongol to Qajar) · Mongol–Persian Ilkhanid hydraulic engineers (maybe Ghiyath al-Din?)
1350 Mongol thin arch 64 m with 1.05 m crest over 5-m gorge, world's tallest for 540 years (1350–1902).